Starting device.



c. CARPENTER.

STARTING DEVICE.

APPLICATION FILED MAY 17, 1907.

Patented Jan. 17,1911.

41/1. M1 IL 624 f m g, I ATTORNEY I a. a, M

- Devices, of which UNITED STATES PATENT OFFICE.

CHARLES E. CARPENTER, OF NEW YORK, N. Y., ASSIGNOR TO TI-IECUTLER-HAMMER MFG. (30., OF MILWAUKEE, WISCONSIN, A CORPORATION OFWISCONSIN.

STARTING DEVICE.

To allwhom it may concern:

Be it known that I, CHARLES E. Gamma run, a citizen of the. UnitedStates, residing at New York city, in the county of New York and Stateof New York, have invented new and useful Improvements in Starting thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawing, forming a part of thisspecification.

My invention relates to starting devices for electric motors and has forits object the provision oi means operating under predeterminedconditions in connection with the starting means of the motor foropening the circuit through the motor as long as the predeterminedconditions exist.

I have illustrated in the accompanying drawings one embodiment of myinvention for the purpose of disclosing the same. and in said drawings:Figure l is a front elevation of a starting box embodying my in vention,having also indicated thereon a diagrammatic circuit arrangement. Fig. 2is a perspective view of a portion of the rod on which the main switchis mounted.

In the embodiment of the invention illustrated, the anions parts oi thestarting the vice are mounted upon a suitable base or panel 2 formed ofslate or like insulating material. The movable element ot' the mo torcontrolling device comprises an arm 3 pivoted upon a stud at; projectingfrom the panel One end oi a coiled spring 5 bears against the arm andthe other end oi the spring is stationarily connected to the base orpanel, whereby the spring will have a tendency to move the arm to theotl' position or to a position where it rests upon the last. of the deadcontact buttons (3, which are sccured circularly upon the base 2. Thearm is provided with a spring 'contact brush 7 arranged to sweep overand make contact with a plurality of contact buttons 8 circularlyarranged upon the base 2. and connected with sections of a resistance 9which may be mounted upon the rear oi the panel 2. The arm 3 is providedwith an armature l0 pivotally secured thereon by a bolt It and arrangedto be held when movedinto engagt-anent therewith by the pole pieces .12.ot' a magnet l3. secured upon the base 2 at the limit of the on positionof the arm I). A circuit breaker is also mounted upon the base 2 andcomprises a main switch H an Specification of Letters Patent.

Application filed May 17, 1907.

Patented Jan. 17, 1911. Serial No. 374,314.

auxiliary switch 15 and an overload magnet is. The main switclr l4comprises a. pair of brushes 17 preferably formed of laminations orstrips of copper secured in a cup 18 mounted upon a vertically movablerod 19. The cup may be secured in any suitable manner but I ha e hereillustrated it as being secured between a pair of nuts 20 and 21 screwedupon the end of the rod 11). The rod extends through an opening in astud 22, which aids in guiding the same and carries the auxiliary switch15, which in the present instance takes the form of a disk resilientlysupportedlupon a coiled spring 23 *arried by the rod 12) on a collar 24.The brushes 1? are arranged, when the switch is closed, to bridge a pairof stationary contacts 25 and 26 and the disk 15 is arranged to bridgea, pair of stationary contac-ts27 and 28. The disk 15 is arranged toengage the contacts 27 and 28 prior to the engagement of the brushes 17,with the contacts 25 and 26 but due to the resilient mounting thereofthe rod 19 will continue in its upward move-- ment until the brushes l7engage the contacts 25 and 26. The upper end of the rod ltt extendsthrough a bracket 29 and is provided with a collar 30 having a smallprojection 31 arranged to be engaged by a catch 32 formed on one end illoi the bell crank lever, pivoted at 2H lo the base or'panel 2. Theopposite arm 35 ol the bell crank lever is adapted to extend to aposition immediately above the core ot' the magnet 16, whereby when thecore 36 is raised, the arm 35 will be raised, disengaging the catch 32.The core Eiti in its lower position rests upon an adjusting screw 37extending through a stud 38, secured upon the base and a calibrat ingstrip 31) for the core is secured at one end to the stud 38, and at itsopposite end to one of the pole pieces 4-0 of the magnet 16. Theopposite pole piece 41 of tlie nag not 16 is connected with the bracket29 whereby the bracket 't'orms an extension thereof, audit will be notedthat the contact 28 of the circuit breaker is arranged in the magneticcircuit of thc poles of the magnet 16, which circuit extends from thepole piece 40 to the bracket 29 and thence .to the opposite pole piece4-1.

The circuit breaker is set by a curved arm 4-2 extending from the hub 43to the arm arranged when the arm 3 is moved to the first of the deadcontacts 6 to engage beneath the collar 2 1 and raise the rod 19 untilthe catch 32 engages and supportsthe ci cuit breaker in a closed,position.

One binding post ll of the starting device is connected by conductorwith one terminal of the armature 416 of the motor, the oppositeterminal of which is connected by conductor 47, with the positive side48 of the line. The binding post ll is also connected by a conductor 49with the last of the contact buttons A second binding post 50 of thestarting device is connected by a conductor 51 with one terminal of theshunt field winding of the motor, the opposite terminal of whichconnected with the conductor 47. The binding post 50 is also connectedby the conductor with one terminal of the winding of the magnet 13, theopposite terminal of which'is connected by conductor with the first ofthe live contacts 8. A third binding post of the starting device isconnected by the conductor 56 with oneterminal of the winding of theoverload magnet 16, the opposite terminal of which is connected by aconductor 57, with the stationary contact 28 of the circuit breaker, andwith the main switch contact 9" The stationary contactQT of the circuhbreaker is connected by conductor 58 with' the arm 3 and by conductor5.) with the. main switch contact 25. In operation, assuming that thearm 3 is on the last of the dead contacts 6, in order to start the motorthe arm is moved to the left as far as it will go, when the short arm 42will engage the collar 24 lifting the rod 19; and'closing the mainswitch 17 and auxiliary switch 15. The catch 32 will engage theprojection 31 on the collar 30, and retain the rod in a raised position.The circuit breaker being closed, the arm 3 is moved to the right untilit engages the first of the contacts is, when circuit will beestablished from the posit .ve vside 4-8 of the line, by conductor 47,through the armature 46, by conductors l5 and 4!), through all of theresistance 9, acrossthe arm 3, by contluctors 58 and 59, acrossthcswitchli'ah vl'll1lilll('l()l' 57 through the overload ma nct lthby conductor5b, and thence to the negative :-=idc oi the line. The lieldcircuit willalso be establislu d 'l'rom conductor i i, through llit field. and byconan .33, through the retaining magnet ll). then by cond u'tor :rl, tothe first ol the conta tsv and ty the arm 3 lo the negative side of theli. c. 'ihc motor tlHlH tarts with all e in the armature circuit and asthe arm :2 moved to the right. the armature re:-1istance i) is graduallyout until the arm reaches its i'ull "011 1) i ion. when it will berctaincd in that position by the retaining magnet 1?). -ln t-vcni l anoverload the core 236 of the magnet lli will be attracted and engagingthe arm 35 will kick the catch 35 loose permitting the circuit breakerto open and thereby open the circuit through the motor and at the sametime deenergizing the magnet 13,

its o position, when, to start the motor again, it will be necessary torepeat the above described operation. Also if when the motor is startedthe arm 3 is moved too rapidly or if the motor does not start and theoperator continues to move the arm to full speed position, the currentwould increase to the point where the plupger 36 would be attracted tounlatch the r 19 and open the circuit. I

When the arm 3 is moved to its ofi "position, that is, on the last ofthe dead contacts 6, a closed loop is established from one terminal ofthe armature by conductors 45 and 49, through the resistance 9 byconductor 54, through the winding of the magnet 13, and by conductors 53and 51, through the field 52 to the opposite terminal of the armature.This takes u the field discharge.

'Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

l. The combination with the movable element of a controller, of acircuit breaker comprising a longitudinally movable member carrying theswitch contacts thereof, a retaining device for the circuit breaker, andan electromagnet responsive to an abnormal increase in current in themotor circuit for releasing said retaining device. said circuit breakerbeing adapted to be set by the movement of the movable element of thecontroller.

2. The combination with a movable arm of a controller, of a slidablymounted circuit breaker arranged to be set by said arm when in apredetermined position, said circuit breaker having a main and anauxiliary contact. a retaining device for said circuit breaker, andmeans responding to abnormal increase in current in the motor circuitfor releasing the same.

3. The combination with the movableelcment of a controller, of aslidably mounted circuitbreaker having a main and an auxiliary contact,an electromagnet respondingto abnormal increase in current in the motorcircuit for releasing said circuit breaker and means operated by saidmovable member for setting said circuit breaker.

i."'lhc combination. with the movable element ot' a rheostat, of acircuit breaker comprising a Wlllll and an eleotromagnet re sponsive toan abnormal increase in current in the motor circuit for releasing saidswitch, said eha-tro-magnet having pole pieces for disrupting the areformed upon the opening of said switch, said switch being arranged to bemechanically set by said rheostat element.

a. The combination, with the movable member of a rheostat, of a circuitcontrol- )ermitting the arm 3 to move back to ling switch arranged to bemechanically set by said member when in initial position, said switchhaving main and auxiliary contacts, and an overload magnet adapted torelease said switch, said magnet ha ving pole pieces for disrupting theare formed upon the opening of said switch.

6. The combination with the movable member of a controller, of aretaining device for the same responding to abnormal decrease incurrentin the motor circuit for releasing said movable member, and acircuit breaker adapted to be set by said movable member comprising alongitudinally movable member carrying a switch contact, means tonormally hold the switch closed, and an electro-responsive device opeating under abnormal increase in current, in the motor circuit torelease said second mentioned movable member.

7. The combination with a movable member of a controller of a circuitbreaker comprising stationary contacts and a movable element carrying amain contact and an auxiliary contact adapted to abut against saidstationary contacts, said auxiliary contact being resiliently mounted tocause said contacts arried by said element to engage and disengage theirstationary contacts in inveise order, said movable element of thecircuit breaker being arranged to be operated by said controlling memberwhen in a predetermined position, means for retaining said movableelement of the circuitbreaker in operative position, anelectro-responsive device for causing said means to release said movableelement of the circuit breaker under predetermined conditions.

8. The combination with the movable. member of a controller, of aretaining elcc tro-magnet tor said movable member responding to abnormaldecrease in the motor circuit for releasing said movable member, acircuit breaker comprising a vertically movable rod and a contactthereon adapted to be closed by said movable member, a catch adapted toengage the rod when the contact is closed, and a device responding toabnormal increase in current in the motor circuit for releasing thesame.

9. The con'il'iination with the movable member of a controller, of acircuit breaker adapted to be set thereby and comprising alongitudinally movable. member carrying a main and auxiliary switchcontact, a re taining device for said vertically movable member adaptedto normally hold the contacts closed and an electro-responsive de viceoperating under abnormal increase of the motor current for disconnectingsaid re taining device.

10. The combination with the movable member of a controller, of acircuit breaker comprising a sliding rod having a main and an auxiliarycontact thereon, a retaining device for said circuit breaker respondingto abnormal current in the motor circuit for releasing the same. andmeans operated by saidmovalile member of the controller only when themovable member is in an off position for setting said circuit breaker.

11. The con'ibimit'ion with the movable member of a controller, of acircuit breaker comprising a vertically movable rod, a main andauxiliary switch contact carried by said rod adapted to be successivelyclosed by the movement of said rod, a catch for retaining said rod inits raised position and an electro-responsive device responding to anabnormal increase in the current of the motor circuit for releasing saidcatch.

12. The combination with a movable member of a controller, of a circuitbreaker comprising a vertically movable rod, a pair of switch contactscarried by said rod and adapted to be successively closed by the raisingof the same, a catch for retaining said rod in its raised position, anelectro-responsive device responding to abnormal increase in the currentof the motor circuit for rele: sing said catch and a projection carriedby the nu *able member of the controller for raising said rod, operativeonly when the movable member of the controller is in its ofl position.

13. The combination with a. movable member of a controller, of a.resistance controlled thereby, a retaining magnet for said movablemember connected in the field circuit of the motor, a switch forcontrolling the armature circuit of said motor comprising" a verticallymovable member carrying a main and an auxiliary contact. a retainingdevice for said vertically mo able member, an electro-magnet connectedin the armature circuit ot' the motor and responding to an abnormalincrease in current for releasing said retaining device, and an armcarried by the mo able member of the controller for rais-- ing saidvertically movable member. operative only when the movable member of thecontroller is in an off position.

1-1. The combination with a motor of a resistance therefor, a movablearm for controlling said resistance, a switch comprising a verticallymovable rod carrying a main and an auxiliary switch contact thereonadapted to be successively closed upon the raising of said rod, aprojection on the mov able member of the controller for raising said rodoperative only when the movable member is in an oft position, aretaining catch for holding said vertically movable member in a raisedposition, an electro-responsive device connected in the armature circuitand adapted upon an abnormal increase oi current in the arn'iaturecircuit for releasing said catch, and a retaining magnet tor saidmovable member of the controller connected in the field circuit of themotor lSO I for retaining said arm in its on position breaker isarranged, for disrupting the arm formed by the opening of said contact.

15, The combination with the movable member of a controller and anextension on said member; of a circuit breaker comprising a rod, anauxiliary and a main contact carried by said rod adapted to'besuccessively closed upon the movement of said rod in one direction, alatch for engaging said rod when the contacts are closed, an overloadmagnet for disengaging said latch upon an abnormal current, saidextension on the movable member adapted to close said contacts only whenthe member is in otl position.

16. The combination with the movable member of a. controller, and 'anextension on said member: of a 'CllCllltbreaker compris- Q ing avertically movable rod. an auxiliary and a main contact carried by saidrod adapted to be successively closed, a latch for engaging said rodwhen. the contacts are closed. said extension on the movable menu beradapted to close said contacts only when the member is in off position,and an overload magnetadapted to respond to'an abnormal increaseoticurrent to disengage the latch, the pole pieces of said magnet he.-in g so arranged as to disrupt the arc formed by the opening of saidauxiliary switch.

17. The combination with the movable member of a controller, a springtending .to return said member to initial position, an extension on saidmovable member. an electromagnet to retain said member in its onposition and adapted upon abnormal tie-- crease of current to releasesaid movable member. of a circuit breaker comprising a verticallymovable rod, an auxiliary and a main contact carried by said rod adaptedto be successively closed. a latch for engaging formed upon the said rodwhen the contacts are closed, said extension on the movable memberadapted to close said contacts only when the member is in oli position,and an overload magnet adapted to respond to an abnormal increase ofcurrent to disengage the latch, the pole pieces of said magnet being soarrangd as to disrupt the are formed by the opening of said auxiliaryswitch.

18. In combination, an electromagnet and a longitudinally movable membercarrying 'a switch contact, said magnet havin a. pole piece forming aguide for said mem er and another pole piece so disposed as to causesaid magnet to disrupt the are formed upon the opening of said switchcontact.

19. In a circuit-breaker, in combination, a longitudinally movablemember carrying I switch, means for retaining said member in position toclose said switch, and an overload magnet adapted to respond to releasesaid member, piece forniing a guide for said member and another polepiece so disposed as to cause said magnet to disrupt the are formed uponthe opening of said switch.

20. The combination with the movable element of a rheostat, of a circuitbreaker arranged to be set by said element when in a predeterminedposition, comprising a. longitudinally movable member, and a switchcarried thereby, means for retainin said member in position to closesaid switc and an overload magnet for releasing said member, one of thepole pieces of said magnet forming a guide for said member, and theother pole piece thereof being so.-disposcd as to cause said magnet todisrupt the are opening of said switch.

In witness whereof, I have hereunto subsaid magnet having a pole.

scribed my name in the presence of. two

